"He left me at our engagement party after he accused me of hooking up with his friend Stu," the 28-year-old explained to fans in the comments section on Instagram on Tuesday.

"He said in the article he left because I was drunk — NOT TRUE. When I got back to the hotel he wasn’t there. When he got back I asked where he was and he said he was with his French ex f*ck buddy (who he used to tell me sex stories about) and insinuated that he cheated on me (he would often play games like this to make me jealous).

"When he told me he cheated on me, I hit him and cried and told him to get out of my hotel. After he realised that the game backfired and I was done, he told me he didn’t touch her and just went to her house to help her find her cat (that was the emergency he spoke of)."

Tara insisted she was not a "violent person" and was in an "emotionally abusive relationship with a narcissist".

"Only someone who has been through that can relate to how f*cking bad it is, and how you can be pushed over the edge."

Tara and Sam at a party in June before their breakup. Image: Getty.

Sam, however, told Woman's Day that Tara's "excessive drinking" often caused her to lash out at him.

He said after the Bachelor in Paradise finale aired "everything spiralled".

"The relationship took a back seat, the drinking kicked in and then the violence started."

On Instagram, also on Tuesday, he wrote that after deciding he wouldn't air the couple's relationship woes in public, he now planned on "doing all I can to shed light on [domestic violence] and help both men and women".

"There is no excuse, no reason or way of justifying it. I hope this will be the last time I have to discuss her or the relationship."

If this post brings up any issues for you, or if you just feel like you need to speak to someone, please 1800 RESPECT (1800 737 732) – the national sexual assault, domestic and family violence counselling service. It doesn’t matter where you live, they will take your call and, if need be, refer you to a service closer to home.